[openstreetmap/openstreetmap-website] Minimum/maximum supported URL length for API queries is not documented (or guaranteed fwiw), provide it via capabilities call (Issue #4850)

[Simon Poole]

### Problem

A number of the API queries can have a variable number of parameters, for example both the element and user multi-fetch API. However no minimum and/or maximum supported length of the URL is documented, outside of what somebody found out by experimentation see https://wiki.openstreetmap.org/wiki/API_v0.6#Multi_fetch:_GET_/api/0.6/[nodes|ways|relations]?#parameters

Normally I would have suggested to simply document what both the maintainers and OSM ops consider they should support, but given reality, I believe it would be better to provide the current value via the _capabilities_  call so that API users can dynamically adapt to whatever is currently supported. 



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